Placemats like these would make a fabulous addition to your outdoor picnic table, especially when celebrating holidays like Memorial Day and the 4th of July. They are made with plarn, an interesting material to upcycle for use in crocheting placemats. This free pattern also comes with instructions for complementary plarn coasters.
Note that it's not recommended to use these placemats for hot dishes, but they're ideal when serving sandwiches, salad, pickles, or other similar picnic fares. Best of all, plarn is easy to make (for free) using readily available materials. And of course, you could opt to use different plastic bag colors to make similar crochet placemats without the red, white, and blue theme.